Weft detector for looms



Nov. 30 1926.

A. J. CHEVRETTE WEFT DETECTOR FOR'LOOMS Filed June 18, 1925 2Sheets-Shea?I 1 Lire/lfm @wf/)7 Czar/@fa Nov. 30 1926.

. A, J. CHEVRETTE wEFT DETECTOR FOR LooMs Filed June 1a. 1925 2sheets-sheet ,c

Irre/ifa Patented lilov. Eid, l

lili-lidi@ F MASSACHUSETTS.

wnrr nnrnofron non Looms.

Apnlieation filed June 18, 1925. Serial No. 38,672.

This invention relates to improvements in detecting mechanism 'for weftreplenishing looms and an object o'l the invention is to provide adetector which shall be unaffected by the angular position of the bobbinin the shuttle.

In multi-color looms the weft detector is required to cooperate with twoor more shuttles the springs of which may not hold the bobbins at thesame angle. It is found that due to the inaccuracies oi the bobbinsprings the tips ol' seine bohbins will be disposed rearwardly withrespect to the axis of the shuttle while the tips oi3 other bobbins willbei forward o-E the shuttle axis. Under such conditions it the detectorbe set to leave a safe amount of yarn on a rearwardly disposed bobbin itwill not be set properly for a bobbin which is disposed 0 forwardly.

lt is a further object ofiny invention to provide a pair ot cooperatingdetectors oi the yarn penetrating and side slippingf type.y

Vthe yarn penetrating members being spaced and each cooperatingr with aseparate angularly movable toothed detector arranged to movelongitudinally of the bobbin atwett exhaustion.

It is a still further object of the invention to provide a pair ofdetectors having' side slipping elements to cooperate with the loomcontroller in such a way that if either element is held againstindicating1 movement the controller will be prevented from indicatingtransfer even though the other element is treeto move.

YVith these and other objects in view which will appear as thedescription proceedsa mv invention resides in the combination andarrangement ot parts hereinafter described and set forth in the claims.

ln the accompanying drawings wherein I' have shown one convenient formof my invention,

Fin'. l is a top plan view ot a weit detector having my inventionapplied thereto.

Fig'. 2 is a side elevation oi the detector looking: in the direction ofarrow 2. Fin. l.

Fig. 3 is a central vertical longitudinal section on line ot Fig.f i,the parte beino in normal position,

l` l is a rear elevation ot the detector looking in the direction ofarrow Il, lligs. :2 and 3.

Fing. 5 is a, horizontal section on line 45H5 oit Fig. 4., showing theinterior mechanism ci the detector in normal imnindicating` position,

6 is similar te Fig. 5 showing` the parts in indicating position. and

Fiss. 7 and Si are vertical sections on lines 7--7 and 8MS respectivelyoi? Fig'. 5.

Referring more particularly to the drawings it will be seen that l haveprovided a bracket l0 from which extends laterally arm 1l in which issecured a stud 1?.. A ,teeler bed 1.8 is mounted on said stud and hasmounted tor longitudinal movement therein a slide lll havingvupstandinp; therelironi a clip 15 (see Fin'. 3). A cap i6 is secured tothe hed 13 and has mounted. therein a stud 1'? with an enlarged threadedhead 18 received in the rear vertical wall ot the cap. A spring 19interposed between the forward wall et the cap and the clip holds thelatter against the head 18 oi the stud and permits yielding l'orwardmotion ci? the slide.

Upstanding 'from the bracket l() is a horn .20 which receives arearwardly extending; loom controller 2l mounted on the upper end ot anarm F22 secured to a sha-,Ft Said shaft is rotatably mounted in arms Q4extending forwardly from the braclret l0 and is surrounded by a coilsprinn; interposed between a collar 26 secured to the shaft and one otthe arms 24. Said spring' 525 holds the rear end of the controller 2lnormally under a floating" actuating; lever 27 which receives motionfrom a vertically reciprocating block 2S and has connection with thereplenishine,Y mechanism (not shown) by'means ot' a link 29. The shaitt23 has secured thereto an arm 30 normally positioned by a afovernor 3land the parts are so aifangged that the controller 2l. will be movedfrom under the actuating; lever 27 when the latter descends on a nongli.

' indicating pick of the loom. On'indicating picks, however, thegovernor 31 will remain stationary, as will also the arm 80, topermitthe controller 21 to remain under thel lever 27 and as the latterdescends it willV `to the devices which control the position of thegovernor 81. ln carrying out my invention I provide the slide 14 with apair of yarn penetrating detectors 4() and 41, respectively, which maycom'f'enientlyY be Vformed on the ends of bars 42 extending between theupper and lower plates 43 of the slide 14. Extending between said platesis a screw and nut 44 on which are pivotally mounted lower and upperside slipping toothed detectors 45 and 46, respectively. The slide 14has fixed thereto a partition or wall 47 which extends parallel to theplates 43 and between the bars 42 to separate saidV detectors 45 and 46andguide the same in spaced parallel guideways. The detector 45 hasextending to the left therefrom an arm 48 and the detector 46 has Vasimilar arm 49, said arms being bent downwardly as indicated in Figs. 2and 4.

Secured to the under side of the bed 13 is a stop 50 having oppositelyextending lingers 51 which engage the arms 48 and 49 to hold thecorresponding` detectors against their penetrating detectors. Said stop50 is provided with a slot 52 through which extends a holding screw 53by means of which the position of said slide may be adjusted forwardlyand rearwardly and said stop is guided to slide between bosses 58adepending from the bed 18. As shown more particularly in Fig. 5 therearend of the governor 81 is threaded into a head 54 having horns 55which are spaced equally from the axis of the governor 31 and engage thedepending portions of the arms 48 and 49, respectively, at pointsopposite the fingers 51. Bloc-ks 56 are secured to the slide 14 andguide the governor 31 so that the horns 55 are always in alignment witharms 48 and 49. 'The rear face of lever 30 is slotted as at 57 toreceive the T-shaped end 58 of the governor and prevent rotation of thelatter. The right hand horn 55 passes between the upper plate 43 of theslide and the adjacent side bar 42 to prevent rotation of the head.Under normal condition'` the spring 19 will hold the slide 14 rearwardlywith the arms V48 and 49 against the fingers 51 so that pivoteddetectors 45 and 46 are adjacent penetrating detectors 40 and 41,respectively. As a bobbin W supplied with sufficient yarn for continuedweaving is presented to the detector the forward surface hereof willengage the pivoted detectors 45 and 46, restraining pivotal motionthereof, and the slide 14 will be moved forwardly carrying the governortherewith to move the controller 21 from under the lever 27. Vllheninsufficient yarn is present onthe bobbin the penetrating detectors willengage the bobbin and move the slide 14 forwardly but the pivoteddetectors will be unresisted and therefore free to move angular-ly aboutthe screw 44 under influence of the horns of the governor. T he latterwilll therefore remain stationary and the cont-roller will be underlever 27 as it moves down. Should the front surface of the bobbin bedisposed obliquely with respect to the slide 14 as shown at the dottedline'60v in Fig. 5 detectors 41 and 46 will not be engaged by the bobbinand will therefore be free to move, but so long as sufficient yarnremains on a bobbin so disposed the detector 45 will be held againstangular motion and arm' 48 will press against the corresponding horn 55and move the governor 31' forwardly to prevent indication of transfer.Then lindication of weft exhaustion is desirable penetrating detector 40will be pushed forwardly by the wood of the bobbin and detector 45 willbe free. to rotate, which time indication of transfer will be given asprevious` ly described. Under these conditions a relatively large amountof waste will result, but if the mechanism lwere supplied with detectors41 and V45 only the bare bobbin would strike the swinging detector andprevent angular movement thereof. Should the bobbin be disposed intheopposite direction but obliquely with respect to the slide as indicatedat line in Fig. 5 a similar condition will exist with pivoted detector46 determning the time of operation of controller 21. TheV teeth of thepivoted detectors 45 and 46 are normally forward of the line joining thetips of the penetrating detectors 40 and 41 and this position can bevaried if desired by constructing screw 44 as shown in Patent No.989,429.

From the foregoing it will be seen that if the right hand pair ofdetectors only were employed a bobbin disposed as indicated by line 70would have left thereon an undue amount of waste yarn while a bobbindisposed as indicated at line 60 would prevent angular motion of thedetector 45 and thereby prevent indication. By using two pairs ofdetectors with the penetrating` members separated as shown I am able tovdetect with equal accuracy on bobbins which are disposed obliquely ineither direction with respect to the axis of the detector and saiddetector also operates properly when the bobbin is perpendicular to theaxis of the detector. Also, it will be 'noted that if Loose/ie eitherpivoted detector is restrained against lateral motion controller 2l Willbe moved to prevent indication of `Wett exhaustion even though the otherdetector be tree to move on its pivot. The oppositely extending horns ofthe governor head prevent angular motion ot' the same with respect to`the slide let and the stop 5l is adjustable to move the pivoteddetectors to their proper normal position when the clip l5 is againstthe head 18 of the stud 17.

Having thus `described my invention it will be apparent that changes andmodifications may be made therein by those skilled in the art Withoutdeparting from the spirit and scope of the invention, and I do not Wishto be limited to the details herein disclosed but what I claim is:

l. In a weft detector for looms, an actiiator lever, a controllertherefor, a slide movable under influence ot the advancing bobbin, tivopairs ot detecting elements` mounted on the slide, each pair capable otdetecting independently7 oiI the other, and means to change the positionof the controller only at suoli times both pairs ot detectors haveindicating movements.

2. In a Wett detector tor looms, an actuator lever, a controllertheret'er, a slide movable under iniuence oi' the advancing bobbin, anda pluralityT oit pairs ot detecting elements carried by the slide, eachpair being effective to detect presence of Wett independently ot' theother pair, and a governor operatively connected to the pairs otdetectors and operable thereby to determine the position ot thecontroller only at such times as both pairs ot detectors have indicatingmovements.

In a Wett detector for looms, an actuator lever, a controller therefor,a slide movable rectilinearly under influence of the advancing bobbin, apair of spaced yarn penetrating' detectors carried by the slide, a pairoi angularly movable detectors pivotally mounted on the slide, eachpivoted detector cooperatingr vvith one ot' the yarn penetratingdetectors to constitute a. detecting unit, each unit being effective todetect yarn presence independently ot the other unit, and connectionsbetween said detectors and the controller to determine the position oit'the controller from either. unit, said controller being operativelyrelated to the actuator lever only at such times as both units haveindicating movements.

l. In a Weit detector for looms, an actuator lever, a controllertherefor, a slide movable rectilinearly under influence ot the advancingbobbin, a yarn penetrating detector on each side of the slide, alaterally movable detector for each yarn penetrating detector pivoted tothe slide, the penetrating and movable detectors constituting aplurality of detector units each eiiective to detect presence otl yarnindependently of the other, and connections between said units and thecontroller to determine the position of the latter' from either unit,said controller being operatively related to the actuator levell only atsuch times as both units have indicating movements. v

In a weft detector Yt'or looms, an actuating lever, a controllertherefor, a slide movable under influence ot the advancing bobbin, apair ot' spaced yarn penetrating` detectors secured to the slide, a pairot angnlarly movable toothed detectors to contact with the yarn, one ofsaid pivoted detectors cooperating With one of the yarnpenetiatingdetectors to constitute a detecting unit. a common pivot for saidangularly movable detectors, and connections from said netectors to thecontroller to prevent indication ot Wett exhaustion when either ci saidangularly movable detectors is held against lateral motion.

G. In a Wettdetector for looms, an actuator lever, a controller therefornormally in operative position with respect to the ac tuator, slideVmovable rectilinearly under influence of the advancing bobbin, a pairot spaced yarn penetrating detectors on the slide, a pivoted detectortor each yarn penetrating detector mounted on the slide and movablelaterally with respect thereto in the direction of the length oi thebobbin, oppositely extending arms for the movable detectors, a governorhaving spaced horns to engage the arms and tending to move the pivoteddetectors in the direction of the length of the bobbin as the slidemoves forwardly, said governor being operatively oonnected with thecontroller and moving the latter to inoperative position when thepivoted detectors are held against movement with respect to the slide,said controller remaining in operative position When said pivot-eddetectors move laterally.

7. In a weft detector Jfor looms, an actuator lever, a controllernormally in operative position with respect thereto, a slide movablerectilinearly under influence of the advancing bobbin, a pair of spacedyarn penetrating detectors for the slide, a pair ot laterally movabledetectors on the slide, arms extending from said movable detectors inopposite directions, a fixed stop tor the arms, yielding means to holdsaid slide toward the bobbin, a governor tending normally to hold thearms against the stop, and connections from the governor to thecontroller to move the latter to inoperative position when eithermovable detector is held against movement with respect to the slide,said governor and controller remaining in normal position when themovable detectors are free to move angularly Withrespect to the slide.

8. In a Wett detector for looms, an actuator lever, a controllertherefor, two pairs of detecting units movable forwardly under influenceof the advancing bobbin, each unit having a yarn penetrating element anda second element movable in the direction ot' the l'engthrof the bobbinat substantial eX- haustion ofv weft, and means operatively connectingthe controller and units to prevent indication of weft exhaustion unlessboth units have indicating movements.

9. In a weft detector for looms, an actuator lever, a controllertherefor, two pairs of detecting units movable forwardly under influenceof the advancing bobbin, each unit having a yarn penetrating element anda secondelement movable in the direction of the length of the bobbin atsubstantial eX- haustion of weft, and means operatively connecting` thecontroller and units to prevent indication of weft exhaustion unlesslarly moving actuator lever,V a controller,

therefor normally operatively positioned relatively thereto, two pairsof detecting" unitsl` each unit comprising a pivotedV de tector and ayarn penetrating detector Co-` operating therewith, and means to move`said controller out of operative position relatively to the actuatorlever when either detector unit indicates presence of weft and to leavesaid controller operatively related to theactuator lever at such timesonly aS both units indicate absence of weft.V

ln testimony whereof I have hereunto allixed my signature.

AUGUSTIN J. onnvnnrrii.

